Create custom GPT functions in Google Sheets

Integrating OpenAI’s powerful GPT models into Google Sheets can supercharge your spreadsheets with AI capabilities. There are existing sheet extensions (Add-ins) on the Google Marketplace but they cost on top of the API cost.

In this how-to tutorial, we’ll walk through embedding a basic GPT functionality in Google Sheets using Google Apps Script and OpenAI's API.

By the end, you’ll have a custom =GPT() function that calls the Open AI API directly from any cell with a formula.

Don’t worry if you’ve never coded before – we’ll keep things friendly and simple.

Key Objectives

• Obtain an OpenAI API key
• Use the provided code for a custom `=GPT()` function in App Script of a Google Sheet
• Use the function to automate GPT in your spreadsheet

Let’s get started!